CombinedChart with BarChartData cuts the first and last bars in half

[zamith]

Everything works fine apart from the fact that the first and last bars are cut in half, this might be something that is expected, if so, how can I disable it?

Here's how it looks:

[liuxuan30]

By default it should not be half.. I am not sure how much you changed? The code will leave some space for the first and last bar. I never see it on my side. You might need to provide more info. Have you changed any view port/offset properties or transformer matrix, etc. Is it zoomed or something.

You can also try your data with the ChartsDemo code to see if it is reproducible.

[zamith]

I haven't changed any viewport things I think, nor should it be zoomed. However, we've decided to go with a linebar, which works fine, so I'm closing this issue.

Sorry about the trouble.

[liuxuan30]

Well it never should be half a bar if you just setup the dataSets. If it is a bug (which I doubt), you could help provide some information.

[zamith]

Ok, I was able to reproduce it on the Demo. If I comment the setting of the bubbleData, the same behavior occurs:

And with the bubbleData:

[liuxuan30]

Are you using combined chart in your project? How about normal bar chart?

[zamith]

Yes, I was using combined chart. The normal bar chart works fine.

[liuxuan30]

Ah hah, it's actually a bug. if you don't have bubble data, it will use another value to determine the chartXMin and chartXMax.

In CombinedChartView -> override func calcMinMax():

            if (self.bubbleData !== nil)
            {
                for set in self.bubbleData.dataSets as! [BubbleChartDataSet]
                {
                    let xmin = set.xMin
                    let xmax = set.xMax

                    if (xmin < chartXMin)
                    {
                        _chartXMin = xmin
                    }

                    if (xmax > chartXMax)
                    {
                        _chartXMax = xmax
                    }
                }
            }
            else
            {
//                _chartXMin = 0.0      <--- current in your code
//                _chartXMax = Double(_data.xValCount - 1)      <--- current in your code
                _chartXMin = -0.5   <--- try this
                _chartXMax = Double(_data.xVals.count) - 0.5     <--- try this
            }

You could try to use above change, if you want to use combined chart without bubbles. BTW, current combined chart just supports single bar, not grouped (I have a PR #269 for grouped support, but it's still in alpha testing :-) )

@danielgindi do you know why use 0.0 if no bubble data?

[zamith]

Yes, that works. Thanks.

[reeyan]

I had the same issue when I upgrade this month. Thanks for the update. Now the issue is gone.

[danielgindi]

Fixed thanks to @liuxuan30 :-)

[venux92]

Hi, I got the same issue actually but with a BarChart.
Is there any fix for this ?

[arorajatin]

The fix for it is adjusting the xAxis paddings.

This is my code:

let xAxisPadding = 0.45
chartView.xAxis.axisMinimum = -xAxisPadding
chartView.xAxis.axisMaximum = combinedChartData.xMax + xAxisPadding

[SentoCrespo]

Still happening on almost 2018.

@arorajatin you're a HERO, Sir 😍

[sadaf-behbahani]

@arorajatin worked for me :) Thanks <3

[liuxuan30]

I have an issue seems related to this: #3186. There are some workaround and root cause I found there. feel free to check it out. I didn't come up with a good solution yet

[milosmilakovic-oviva]

This works in case when you don't have labels on x axis. If you have to print labels on x axis they won't be aligned to rounded values, but will start from -0.5 or -0.45 depending on your implementation.
xAxis.centerAxisLabelsEnabled also can't help.

[jjatie]

As this issue is very old, please open a new issue to report any related problems.

[liuxuan30]

@jjatie no need, I think we already have the root cause in my #3186.